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Thomas G. Lane36a4ccc1994-09-24 00:00:00 +00001/*
2 * jcmarker.c
3 *
DRCa73e8702012-12-31 02:52:30 +00004 * This file was part of the Independent JPEG Group's software:
Thomas G. Lane5ead57a1998-03-27 00:00:00 +00005 * Copyright (C) 1991-1998, Thomas G. Lane.
DRCc44750e2013-11-06 07:37:01 +00006 * Modified 2003-2010 by Guido Vollbeding.
DRCa6ef2822013-09-28 03:23:49 +00007 * libjpeg-turbo Modifications:
DRCc04bd3c2010-10-10 02:15:56 +00008 * Copyright (C) 2010, D. R. Commander.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +00009 * For conditions of distribution and use, see the accompanying README file.
10 *
11 * This file contains routines to write JPEG datastream markers.
12 */
13
14#define JPEG_INTERNALS
15#include "jinclude.h"
16#include "jpeglib.h"
DRCc04bd3c2010-10-10 02:15:56 +000017#include "jpegcomp.h"
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000018
19
20typedef enum { /* JPEG marker codes */
21 M_SOF0 = 0xc0,
22 M_SOF1 = 0xc1,
23 M_SOF2 = 0xc2,
24 M_SOF3 = 0xc3,
DRC5aa6c9a2013-11-06 05:58:38 +000025
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000026 M_SOF5 = 0xc5,
27 M_SOF6 = 0xc6,
28 M_SOF7 = 0xc7,
DRC5aa6c9a2013-11-06 05:58:38 +000029
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000030 M_JPG = 0xc8,
31 M_SOF9 = 0xc9,
32 M_SOF10 = 0xca,
33 M_SOF11 = 0xcb,
DRC5aa6c9a2013-11-06 05:58:38 +000034
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000035 M_SOF13 = 0xcd,
36 M_SOF14 = 0xce,
37 M_SOF15 = 0xcf,
DRC5aa6c9a2013-11-06 05:58:38 +000038
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000039 M_DHT = 0xc4,
DRC5aa6c9a2013-11-06 05:58:38 +000040
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000041 M_DAC = 0xcc,
DRC5aa6c9a2013-11-06 05:58:38 +000042
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000043 M_RST0 = 0xd0,
44 M_RST1 = 0xd1,
45 M_RST2 = 0xd2,
46 M_RST3 = 0xd3,
47 M_RST4 = 0xd4,
48 M_RST5 = 0xd5,
49 M_RST6 = 0xd6,
50 M_RST7 = 0xd7,
DRC5aa6c9a2013-11-06 05:58:38 +000051
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000052 M_SOI = 0xd8,
53 M_EOI = 0xd9,
54 M_SOS = 0xda,
55 M_DQT = 0xdb,
56 M_DNL = 0xdc,
57 M_DRI = 0xdd,
58 M_DHP = 0xde,
59 M_EXP = 0xdf,
DRC5aa6c9a2013-11-06 05:58:38 +000060
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000061 M_APP0 = 0xe0,
62 M_APP1 = 0xe1,
63 M_APP2 = 0xe2,
64 M_APP3 = 0xe3,
65 M_APP4 = 0xe4,
66 M_APP5 = 0xe5,
67 M_APP6 = 0xe6,
68 M_APP7 = 0xe7,
69 M_APP8 = 0xe8,
70 M_APP9 = 0xe9,
71 M_APP10 = 0xea,
72 M_APP11 = 0xeb,
73 M_APP12 = 0xec,
74 M_APP13 = 0xed,
75 M_APP14 = 0xee,
76 M_APP15 = 0xef,
DRC5aa6c9a2013-11-06 05:58:38 +000077
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000078 M_JPG0 = 0xf0,
79 M_JPG13 = 0xfd,
80 M_COM = 0xfe,
DRC5aa6c9a2013-11-06 05:58:38 +000081
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000082 M_TEM = 0x01,
DRC5aa6c9a2013-11-06 05:58:38 +000083
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000084 M_ERROR = 0x100
85} JPEG_MARKER;
86
87
Thomas G. Lane5ead57a1998-03-27 00:00:00 +000088/* Private state */
89
90typedef struct {
91 struct jpeg_marker_writer pub; /* public fields */
92
93 unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
94} my_marker_writer;
95
96typedef my_marker_writer * my_marker_ptr;
97
98
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +000099/*
100 * Basic output routines.
101 *
102 * Note that we do not support suspension while writing a marker.
103 * Therefore, an application using suspension must ensure that there is
104 * enough buffer space for the initial markers (typ. 600-700 bytes) before
105 * calling jpeg_start_compress, and enough space to write the trailing EOI
106 * (a few bytes) before calling jpeg_finish_compress. Multipass compression
107 * modes are not supported at all with suspension, so those two are the only
108 * points where markers will be written.
109 */
110
Thomas G. Lane489583f1996-02-07 00:00:00 +0000111LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000112emit_byte (j_compress_ptr cinfo, int val)
113/* Emit a byte */
114{
115 struct jpeg_destination_mgr * dest = cinfo->dest;
116
117 *(dest->next_output_byte)++ = (JOCTET) val;
118 if (--dest->free_in_buffer == 0) {
119 if (! (*dest->empty_output_buffer) (cinfo))
120 ERREXIT(cinfo, JERR_CANT_SUSPEND);
121 }
122}
123
124
Thomas G. Lane489583f1996-02-07 00:00:00 +0000125LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000126emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
127/* Emit a marker code */
128{
129 emit_byte(cinfo, 0xFF);
130 emit_byte(cinfo, (int) mark);
131}
132
133
Thomas G. Lane489583f1996-02-07 00:00:00 +0000134LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000135emit_2bytes (j_compress_ptr cinfo, int value)
136/* Emit a 2-byte integer; these are always MSB first in JPEG files */
137{
138 emit_byte(cinfo, (value >> 8) & 0xFF);
139 emit_byte(cinfo, value & 0xFF);
140}
141
142
143/*
144 * Routines to write specific marker types.
145 */
146
Thomas G. Lane489583f1996-02-07 00:00:00 +0000147LOCAL(int)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000148emit_dqt (j_compress_ptr cinfo, int index)
149/* Emit a DQT marker */
150/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
151{
152 JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
153 int prec;
154 int i;
155
156 if (qtbl == NULL)
157 ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
158
159 prec = 0;
160 for (i = 0; i < DCTSIZE2; i++) {
161 if (qtbl->quantval[i] > 255)
162 prec = 1;
163 }
164
165 if (! qtbl->sent_table) {
166 emit_marker(cinfo, M_DQT);
167
168 emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
169
170 emit_byte(cinfo, index + (prec<<4));
171
172 for (i = 0; i < DCTSIZE2; i++) {
Thomas G. Lane489583f1996-02-07 00:00:00 +0000173 /* The table entries must be emitted in zigzag order. */
174 unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000175 if (prec)
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000176 emit_byte(cinfo, (int) (qval >> 8));
177 emit_byte(cinfo, (int) (qval & 0xFF));
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000178 }
179
180 qtbl->sent_table = TRUE;
181 }
182
183 return prec;
184}
185
186
Thomas G. Lane489583f1996-02-07 00:00:00 +0000187LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000188emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
189/* Emit a DHT marker */
190{
191 JHUFF_TBL * htbl;
192 int length, i;
193
194 if (is_ac) {
195 htbl = cinfo->ac_huff_tbl_ptrs[index];
196 index += 0x10; /* output index has AC bit set */
197 } else {
198 htbl = cinfo->dc_huff_tbl_ptrs[index];
199 }
200
201 if (htbl == NULL)
202 ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
203
204 if (! htbl->sent_table) {
205 emit_marker(cinfo, M_DHT);
206
207 length = 0;
208 for (i = 1; i <= 16; i++)
209 length += htbl->bits[i];
210
211 emit_2bytes(cinfo, length + 2 + 1 + 16);
212 emit_byte(cinfo, index);
213
214 for (i = 1; i <= 16; i++)
215 emit_byte(cinfo, htbl->bits[i]);
216
217 for (i = 0; i < length; i++)
218 emit_byte(cinfo, htbl->huffval[i]);
219
220 htbl->sent_table = TRUE;
221 }
222}
223
224
Thomas G. Lane489583f1996-02-07 00:00:00 +0000225LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000226emit_dac (j_compress_ptr cinfo)
227/* Emit a DAC marker */
228/* Since the useful info is so small, we want to emit all the tables in */
229/* one DAC marker. Therefore this routine does its own scan of the table. */
230{
231#ifdef C_ARITH_CODING_SUPPORTED
232 char dc_in_use[NUM_ARITH_TBLS];
233 char ac_in_use[NUM_ARITH_TBLS];
234 int length, i;
235 jpeg_component_info *compptr;
DRC5aa6c9a2013-11-06 05:58:38 +0000236
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000237 for (i = 0; i < NUM_ARITH_TBLS; i++)
238 dc_in_use[i] = ac_in_use[i] = 0;
DRC5aa6c9a2013-11-06 05:58:38 +0000239
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000240 for (i = 0; i < cinfo->comps_in_scan; i++) {
241 compptr = cinfo->cur_comp_info[i];
Guido Vollbeding989630f2010-01-10 00:00:00 +0000242 /* DC needs no table for refinement scan */
243 if (cinfo->Ss == 0 && cinfo->Ah == 0)
244 dc_in_use[compptr->dc_tbl_no] = 1;
245 /* AC needs no table when not present */
246 if (cinfo->Se)
247 ac_in_use[compptr->ac_tbl_no] = 1;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000248 }
DRC5aa6c9a2013-11-06 05:58:38 +0000249
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000250 length = 0;
251 for (i = 0; i < NUM_ARITH_TBLS; i++)
252 length += dc_in_use[i] + ac_in_use[i];
Guido Vollbedingc39ec142011-01-16 00:00:00 +0000253
254 if (length) {
255 emit_marker(cinfo, M_DAC);
256
257 emit_2bytes(cinfo, length*2 + 2);
258
259 for (i = 0; i < NUM_ARITH_TBLS; i++) {
260 if (dc_in_use[i]) {
261 emit_byte(cinfo, i);
262 emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
263 }
264 if (ac_in_use[i]) {
265 emit_byte(cinfo, i + 0x10);
266 emit_byte(cinfo, cinfo->arith_ac_K[i]);
267 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000268 }
269 }
270#endif /* C_ARITH_CODING_SUPPORTED */
271}
272
273
Thomas G. Lane489583f1996-02-07 00:00:00 +0000274LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000275emit_dri (j_compress_ptr cinfo)
276/* Emit a DRI marker */
277{
278 emit_marker(cinfo, M_DRI);
279
280 emit_2bytes(cinfo, 4); /* fixed length */
281
282 emit_2bytes(cinfo, (int) cinfo->restart_interval);
283}
284
285
Thomas G. Lane489583f1996-02-07 00:00:00 +0000286LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000287emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
288/* Emit a SOF marker */
289{
290 int ci;
291 jpeg_component_info *compptr;
292
293 emit_marker(cinfo, code);
294
295 emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
296
297 /* Make sure image isn't bigger than SOF field can handle */
DRCc04bd3c2010-10-10 02:15:56 +0000298 if ((long) cinfo->_jpeg_height > 65535L ||
299 (long) cinfo->_jpeg_width > 65535L)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000300 ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
301
302 emit_byte(cinfo, cinfo->data_precision);
DRCc04bd3c2010-10-10 02:15:56 +0000303 emit_2bytes(cinfo, (int) cinfo->_jpeg_height);
304 emit_2bytes(cinfo, (int) cinfo->_jpeg_width);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000305
306 emit_byte(cinfo, cinfo->num_components);
307
308 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
309 ci++, compptr++) {
310 emit_byte(cinfo, compptr->component_id);
311 emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
312 emit_byte(cinfo, compptr->quant_tbl_no);
313 }
314}
315
316
Thomas G. Lane489583f1996-02-07 00:00:00 +0000317LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000318emit_sos (j_compress_ptr cinfo)
319/* Emit a SOS marker */
320{
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000321 int i, td, ta;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000322 jpeg_component_info *compptr;
323
324 emit_marker(cinfo, M_SOS);
325
326 emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
327
328 emit_byte(cinfo, cinfo->comps_in_scan);
329
330 for (i = 0; i < cinfo->comps_in_scan; i++) {
331 compptr = cinfo->cur_comp_info[i];
332 emit_byte(cinfo, compptr->component_id);
Guido Vollbeding989630f2010-01-10 00:00:00 +0000333
334 /* We emit 0 for unused field(s); this is recommended by the P&M text
335 * but does not seem to be specified in the standard.
336 */
337
338 /* DC needs no table for refinement scan */
339 td = cinfo->Ss == 0 && cinfo->Ah == 0 ? compptr->dc_tbl_no : 0;
340 /* AC needs no table when not present */
341 ta = cinfo->Se ? compptr->ac_tbl_no : 0;
342
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000343 emit_byte(cinfo, (td << 4) + ta);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000344 }
345
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000346 emit_byte(cinfo, cinfo->Ss);
347 emit_byte(cinfo, cinfo->Se);
348 emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000349}
350
351
Thomas G. Lane489583f1996-02-07 00:00:00 +0000352LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000353emit_jfif_app0 (j_compress_ptr cinfo)
354/* Emit a JFIF-compliant APP0 marker */
355{
356 /*
357 * Length of APP0 block (2 bytes)
358 * Block ID (4 bytes - ASCII "JFIF")
359 * Zero byte (1 byte to terminate the ID string)
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000360 * Version Major, Minor (2 bytes - major first)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000361 * Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
362 * Xdpu (2 bytes - dots per unit horizontal)
363 * Ydpu (2 bytes - dots per unit vertical)
364 * Thumbnail X size (1 byte)
365 * Thumbnail Y size (1 byte)
366 */
367
368 emit_marker(cinfo, M_APP0);
369
370 emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
371
372 emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */
373 emit_byte(cinfo, 0x46);
374 emit_byte(cinfo, 0x49);
375 emit_byte(cinfo, 0x46);
376 emit_byte(cinfo, 0);
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000377 emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
378 emit_byte(cinfo, cinfo->JFIF_minor_version);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000379 emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
380 emit_2bytes(cinfo, (int) cinfo->X_density);
381 emit_2bytes(cinfo, (int) cinfo->Y_density);
382 emit_byte(cinfo, 0); /* No thumbnail image */
383 emit_byte(cinfo, 0);
384}
385
386
Thomas G. Lane489583f1996-02-07 00:00:00 +0000387LOCAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000388emit_adobe_app14 (j_compress_ptr cinfo)
389/* Emit an Adobe APP14 marker */
390{
391 /*
392 * Length of APP14 block (2 bytes)
393 * Block ID (5 bytes - ASCII "Adobe")
394 * Version Number (2 bytes - currently 100)
395 * Flags0 (2 bytes - currently 0)
396 * Flags1 (2 bytes - currently 0)
397 * Color transform (1 byte)
398 *
399 * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
400 * now in circulation seem to use Version = 100, so that's what we write.
401 *
402 * We write the color transform byte as 1 if the JPEG color space is
403 * YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
404 * whether the encoder performed a transformation, which is pretty useless.
405 */
406
407 emit_marker(cinfo, M_APP14);
408
409 emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
410
411 emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */
412 emit_byte(cinfo, 0x64);
413 emit_byte(cinfo, 0x6F);
414 emit_byte(cinfo, 0x62);
415 emit_byte(cinfo, 0x65);
416 emit_2bytes(cinfo, 100); /* Version */
417 emit_2bytes(cinfo, 0); /* Flags0 */
418 emit_2bytes(cinfo, 0); /* Flags1 */
419 switch (cinfo->jpeg_color_space) {
420 case JCS_YCbCr:
421 emit_byte(cinfo, 1); /* Color transform = 1 */
422 break;
423 case JCS_YCCK:
424 emit_byte(cinfo, 2); /* Color transform = 2 */
425 break;
426 default:
427 emit_byte(cinfo, 0); /* Color transform = 0 */
428 break;
429 }
430}
431
432
433/*
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000434 * These routines allow writing an arbitrary marker with parameters.
435 * The only intended use is to emit COM or APPn markers after calling
436 * write_file_header and before calling write_frame_header.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000437 * Other uses are not guaranteed to produce desirable results.
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000438 * Counting the parameter bytes properly is the caller's responsibility.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000439 */
440
Thomas G. Lane489583f1996-02-07 00:00:00 +0000441METHODDEF(void)
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000442write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
443/* Emit an arbitrary marker header */
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000444{
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000445 if (datalen > (unsigned int) 65533) /* safety check */
446 ERREXIT(cinfo, JERR_BAD_LENGTH);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000447
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000448 emit_marker(cinfo, (JPEG_MARKER) marker);
449
450 emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */
451}
452
453METHODDEF(void)
454write_marker_byte (j_compress_ptr cinfo, int val)
455/* Emit one byte of marker parameters following write_marker_header */
456{
457 emit_byte(cinfo, val);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000458}
459
460
461/*
462 * Write datastream header.
463 * This consists of an SOI and optional APPn markers.
464 * We recommend use of the JFIF marker, but not the Adobe marker,
465 * when using YCbCr or grayscale data. The JFIF marker should NOT
466 * be used for any other JPEG colorspace. The Adobe marker is helpful
467 * to distinguish RGB, CMYK, and YCCK colorspaces.
468 * Note that an application can write additional header markers after
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000469 * jpeg_start_compress returns.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000470 */
471
Thomas G. Lane489583f1996-02-07 00:00:00 +0000472METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000473write_file_header (j_compress_ptr cinfo)
474{
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000475 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
476
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000477 emit_marker(cinfo, M_SOI); /* first the SOI */
478
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000479 /* SOI is defined to reset restart interval to 0 */
480 marker->last_restart_interval = 0;
481
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000482 if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
483 emit_jfif_app0(cinfo);
484 if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
485 emit_adobe_app14(cinfo);
486}
487
488
489/*
490 * Write frame header.
491 * This consists of DQT and SOFn markers.
492 * Note that we do not emit the SOF until we have emitted the DQT(s).
493 * This avoids compatibility problems with incorrect implementations that
494 * try to error-check the quant table numbers as soon as they see the SOF.
495 */
496
Thomas G. Lane489583f1996-02-07 00:00:00 +0000497METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000498write_frame_header (j_compress_ptr cinfo)
499{
500 int ci, prec;
501 boolean is_baseline;
502 jpeg_component_info *compptr;
503
504 /* Emit DQT for each quantization table.
505 * Note that emit_dqt() suppresses any duplicate tables.
506 */
507 prec = 0;
508 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
509 ci++, compptr++) {
510 prec += emit_dqt(cinfo, compptr->quant_tbl_no);
511 }
512 /* now prec is nonzero iff there are any 16-bit quant tables. */
513
514 /* Check for a non-baseline specification.
515 * Note we assume that Huffman table numbers won't be changed later.
516 */
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000517 if (cinfo->arith_code || cinfo->progressive_mode ||
518 cinfo->data_precision != 8) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000519 is_baseline = FALSE;
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000520 } else {
521 is_baseline = TRUE;
522 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
523 ci++, compptr++) {
524 if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
525 is_baseline = FALSE;
526 }
527 if (prec && is_baseline) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000528 is_baseline = FALSE;
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000529 /* If it's baseline except for quantizer size, warn the user */
530 TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
531 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000532 }
533
534 /* Emit the proper SOF marker */
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000535 if (cinfo->arith_code) {
DRCc44750e2013-11-06 07:37:01 +0000536 if (cinfo->progressive_mode)
537 emit_sof(cinfo, M_SOF10); /* SOF code for progressive arithmetic */
538 else
539 emit_sof(cinfo, M_SOF9); /* SOF code for sequential arithmetic */
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000540 } else {
541 if (cinfo->progressive_mode)
542 emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
543 else if (is_baseline)
544 emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */
545 else
546 emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
547 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000548}
549
550
551/*
552 * Write scan header.
553 * This consists of DHT or DAC markers, optional DRI, and SOS.
554 * Compressed data will be written following the SOS.
555 */
556
Thomas G. Lane489583f1996-02-07 00:00:00 +0000557METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000558write_scan_header (j_compress_ptr cinfo)
559{
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000560 my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000561 int i;
562 jpeg_component_info *compptr;
563
564 if (cinfo->arith_code) {
565 /* Emit arith conditioning info. We may have some duplication
566 * if the file has multiple scans, but it's so small it's hardly
567 * worth worrying about.
568 */
569 emit_dac(cinfo);
570 } else {
571 /* Emit Huffman tables.
572 * Note that emit_dht() suppresses any duplicate tables.
573 */
574 for (i = 0; i < cinfo->comps_in_scan; i++) {
575 compptr = cinfo->cur_comp_info[i];
Guido Vollbeding989630f2010-01-10 00:00:00 +0000576 /* DC needs no table for refinement scan */
577 if (cinfo->Ss == 0 && cinfo->Ah == 0)
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000578 emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
Guido Vollbeding989630f2010-01-10 00:00:00 +0000579 /* AC needs no table when not present */
580 if (cinfo->Se)
Thomas G. Lanebc79e061995-08-02 00:00:00 +0000581 emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000582 }
583 }
584
585 /* Emit DRI if required --- note that DRI value could change for each scan.
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000586 * We avoid wasting space with unnecessary DRIs, however.
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000587 */
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000588 if (cinfo->restart_interval != marker->last_restart_interval) {
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000589 emit_dri(cinfo);
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000590 marker->last_restart_interval = cinfo->restart_interval;
591 }
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000592
593 emit_sos(cinfo);
594}
595
596
597/*
598 * Write datastream trailer.
599 */
600
Thomas G. Lane489583f1996-02-07 00:00:00 +0000601METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000602write_file_trailer (j_compress_ptr cinfo)
603{
604 emit_marker(cinfo, M_EOI);
605}
606
607
608/*
609 * Write an abbreviated table-specification datastream.
610 * This consists of SOI, DQT and DHT tables, and EOI.
611 * Any table that is defined and not marked sent_table = TRUE will be
612 * emitted. Note that all tables will be marked sent_table = TRUE at exit.
613 */
614
Thomas G. Lane489583f1996-02-07 00:00:00 +0000615METHODDEF(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000616write_tables_only (j_compress_ptr cinfo)
617{
618 int i;
619
620 emit_marker(cinfo, M_SOI);
621
622 for (i = 0; i < NUM_QUANT_TBLS; i++) {
623 if (cinfo->quant_tbl_ptrs[i] != NULL)
624 (void) emit_dqt(cinfo, i);
625 }
626
627 if (! cinfo->arith_code) {
628 for (i = 0; i < NUM_HUFF_TBLS; i++) {
629 if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
630 emit_dht(cinfo, i, FALSE);
631 if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
632 emit_dht(cinfo, i, TRUE);
633 }
634 }
635
636 emit_marker(cinfo, M_EOI);
637}
638
639
640/*
641 * Initialize the marker writer module.
642 */
643
Thomas G. Lane489583f1996-02-07 00:00:00 +0000644GLOBAL(void)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000645jinit_marker_writer (j_compress_ptr cinfo)
646{
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000647 my_marker_ptr marker;
648
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000649 /* Create the subobject */
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000650 marker = (my_marker_ptr)
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000651 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000652 SIZEOF(my_marker_writer));
653 cinfo->marker = (struct jpeg_marker_writer *) marker;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000654 /* Initialize method pointers */
Thomas G. Lane5ead57a1998-03-27 00:00:00 +0000655 marker->pub.write_file_header = write_file_header;
656 marker->pub.write_frame_header = write_frame_header;
657 marker->pub.write_scan_header = write_scan_header;
658 marker->pub.write_file_trailer = write_file_trailer;
659 marker->pub.write_tables_only = write_tables_only;
660 marker->pub.write_marker_header = write_marker_header;
661 marker->pub.write_marker_byte = write_marker_byte;
662 /* Initialize private state */
663 marker->last_restart_interval = 0;
Thomas G. Lane36a4ccc1994-09-24 00:00:00 +0000664}